New Horizons Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) Post-Launch Checkout Calibrated Data, Version 1.0

This data set contains Calibrated data taken by the
New Horizons Pluto Energetic Particle Spectrometer Science Investigation
(PEPSSI) instrument during the LAUNCH mission phase. These data
were migrated from the PDS3 dataset: NH-X-PEPSSI-3-LAUNCH-V1.1.

PEPSSI is a particle telescope and a time-of-flight (TOF) spectrometer that
measures ions and electrons over a broad range of energies and
angles. Particle composition and energy spectra are measured for H to
Fe from ~ 30 keV to ~1 MeV (but not all species are uniquely separated)
and for electrons from ~30 keV to 700 keV. PEPSSI comprises a
time-of-flight (TOF) section and a solid-state detector (SSD) array
that measures particle energy. The combination of measured energy and
TOF provides unique particle identification by mass and particle energy
depending on the range: for protons from ~30 keV to ~1 MeV; for heavy
(CNO) ions from ~80 keV to ~1 MeV. Lower-energy (>3 keV) ion fluxes are
measured by TOF only, but without the SSD signal, providing velocity
spectra at these energies as well. Due to storage and bandwidth
limitations, all event data cannot be stored or telemetered to the
ground. Instead, a round-robin algorithm is used to save Energy, TOF,
and timing data for select events. The common data products contain
these event and summary measurements, accumulated over fixed periods of
86,400 seconds, with each period in a single file comprising multiple
binary tables.

During the Post-Launch phase of the mission, the PEPSSI
measurements concentrated on initial commissioning of the
instrument. The first PEPSSI commissioning activity was running
the full CPT on PEPSSI to confirm all instrument functionality
after launch. Then commands were sent to open the door, ramp up
bias voltage and HV and confirm full functionality. The
remainder of commissioning activities included calibrating the
instrument thresholds, determining HV settings, loading
classification tables and initialization macros, and
investigating and confirming the instrument pointing. There
were a few days of data collection in which protons and helium
are clearly identified. This phase includes periods in which
the instrument is in normal science mode and diagnostic mode.
The data taken during this period are not intended for scientific study.

Labels were redesigned during migration using the .FIT header and PDS3 .LBL
files, but the data files are unchanged from their PDS3 version.

本数据集包含新视野号（New Horizons）冥王星高能粒子光谱仪科学探测仪器（PEPSSI）在发射任务阶段获取的定标数据。这些数据源自PDS3数据集：NH-X-PEPSSI-3-LAUNCH-V1.1。

PEPSSI是一款粒子望远镜兼飞行时间（time-of-flight, TOF）光谱仪，可在宽能量与角度范围内探测离子与电子。其可测量从氢到铁的粒子组分与能谱，能量范围约30 keV至1 MeV（并非所有粒子种类均可被唯一区分），电子探测范围则为约30 keV至700 keV。PEPSSI由飞行时间模块与固态探测器（solid-state detector, SSD）阵列组成，后者用于测量粒子能量。结合测量得到的能量与飞行时间数据，可根据能区实现基于质量与粒子能量的唯一粒子识别：对于质子，能区范围约30 keV至1 MeV；对于重离子（CNO组），能区范围约80 keV至1 MeV。能量更低（>3 keV）的离子通量仅通过飞行时间模块测量，未搭配固态探测器信号，因此也可获取该能区的速度谱。

受限于存储与带宽资源，无法将所有事件数据存储并下行至地面。因此项目采用轮询算法，仅为选定事件保存能量、飞行时间与计时数据。通用数据产品包含上述事件与汇总测量数据，这些数据以86400秒（即1天）为固定累积周期，每个周期对应一个包含多个二进制数据表的单一文件。

任务发射后阶段，PEPSSI的探测工作聚焦于载荷的初始调试。首项调试任务为对PEPSSI执行完整CPT测试，以确认载荷发射后的全部功能。随后地面发送指令开启仪器舱门、提升偏置电压与高压（High Voltage, HV），并验证载荷的全功能状态。剩余调试工作包括校准仪器阈值、确定高压设置、加载分类表与初始化宏指令，以及调试并确认仪器指向精度。该阶段有数天的数据采集过程，可清晰识别质子与氦核。本阶段包含载荷处于常规科学模式与诊断模式的时段，此期间获取的数据并非用于科学研究。

迁移过程中，我们基于.FIT头文件与PDS3的.LBL文件重新设计了数据标签，但数据文件与原始PDS3版本保持一致。